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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LEVEL 3 INPUTS (Details) $ in Millions | Sep. 30, 2018 CAD ($) $ / bbl $ / Gallon-gal $ / MWh $ / MillionsofBTU-MMBTU | Dec. 31, 2017 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (2,283) | $ (2,192)
Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (2,283) | (2,192)
Level 3 | Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (370) | $ (387)
Market approach valuation technique | Recurring basis | Commodity Contracts - Financial | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (2) |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 2.34 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 4.93 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 3.36 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 51.62 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 178.33 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 76.45 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 1.39 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 1.67 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 1.58 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 26.01 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 72.42 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 47.74 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 1.08 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 6.24 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 2.75 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 29.79 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 123.22 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 81.29 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.71 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 2.16 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 1.13 |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (6) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (38) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (93) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (83) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (141) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (7) |

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